XML 68 R59.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Notes Payable (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Jul. 02, 2013 | Dec. 31, 2014 | Feb. 06, 2015 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility term | 5 years |  |  |
Credit facility amount |  | 150,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  |
Secured Debt, Other |  | 120,000,000 us-gaap_SecuredDebtOther |  | 120,000,000 us-gaap_SecuredDebtOther
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Advance rate used to calculate collateral requirement |  | 75.00%mcy_AdvanceRateUsedToCalculateCollateralRequirement / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Advance rate used to calculate collateral requirement |  | 100.00%mcy_AdvanceRateUsedToCalculateCollateralRequirement / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Bank Of America [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mcy_BankOfAmericaMember |  |
Secured Debt, Other |  | 20,000,000 us-gaap_SecuredDebtOther / us-gaap_DebtInstrumentAxis = mcy_BankOfAmericaMember |  |
Union Bank [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mcy_UnionBankMember |  |
AIS [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Debt, Other |  | 120,000,000 us-gaap_SecuredDebtOther / us-gaap_BusinessAcquisitionAxis = mcy_AisMember |  |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility term | 5 years |  |  |
Commitment fee on undrawn portion of facility |  | 0.125%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility amount |  | 150,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt to total capital ratio | 0.15 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Commitment fee on undrawn portion of facility | 0.125%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt to total capital ratio | 0.25 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Commitment fee on undrawn portion of facility | 0.225%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Debt to total capital ratio | 0.15 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Debt to total capital ratio | 0.25 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Capital And Surplus, Contributions |  |  | $ 10,000,000 mcy_StatutoryAccountingPracticesStatutoryCapitalAndSurplusContributions / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

X
- Definition Advance rate used to calculate collateral requirement. + References No definition available. + Details
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Namespace Prefix: | mcy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Statutory Accounting Practices, Statutory Capital And Surplus, Contributions + References No definition available. + Details
Name: | mcy_StatutoryAccountingPracticesStatutoryCapitalAndSurplusContributions
Namespace Prefix: | mcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of other collateralized debt obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_SecuredDebtOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mcy_BankOfAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mcy_UnionBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |